20502589 has 2 divisors, whose sum is σ = 20502590. Its totient is φ = 20502588.

The previous prime is 20502571. The next prime is 20502631. The reversal of 20502589 is 98520502.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12425625 + 8076964 = 3525^2 + 2842^2 .

It is a cyclic number.

It is not a de Polignac number, because 20502589 - 2¹¹ = 20500541 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20502589.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20502509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10251294 + 10251295.

It is an arithmetic number, because the mean of its divisors is an integer number (10251295).

Almost surely, 2^20502589 is an apocalyptic number.

It is an amenable number.

20502589 is a deficient number, since it is larger than the sum of its proper divisors (1).

20502589 is an equidigital number, since it uses as much as digits as its factorization.

20502589 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7200, while the sum is 31.

The square root of 20502589 is about 4527.9784672633. The cubic root of 20502589 is about 273.6967047336.

The spelling of 20502589 in words is "twenty million, five hundred two thousand, five hundred eighty-nine".